Immobilizer when freezing needs battery disconnect for 30 seconds to start?

Yep, the cold can cause the electronics to go out. I have seen the MICU go out which is a part of the fuse panel. Here are the wiring diagrams for the immobilizer system so you can see how the system works. There is an outside chance the dash cluster is bad as well, but I am leaning toward the MICU. Here is how to replace the unit so you can see what needs to be done. Check out the images (below). Please let us know what happens.

Good info. I am sourcing Micu How much Shop time will it take to swap and reprogram Key fob.

Sorry it really does not give specific times for this particular repair, but I can guess about 2 hours @ the shop rates would be a good estimate.

The Immobilizer loses chip and key fob recognition when it is Hot and Cold weather. Runs perfect after 20 sec. Battery disconnect reconnect. Thus far dealer had it 3 months changed ignition pick up coil, Relay, Starter switch, Micu, and ECM connections were traced and Neutral safety switch for good Ju Ju but no luck.
Thanks for all your Assistance this is a Learning Curve here.

Did the dealer run a CAN scan? This is the step I would take at this point; you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is one for about $99.00 if you need it:

https://amzn.to/3ZixY4v

They Scanned it No codes; IGot a Launch 909E and no immobilizer code when not starting or other codes.

Does it act the same with both keys? If the module is okay, I am leaning toward the MICU going bad. This will not show any codes when it goes out.

Yes, both keys work great. Honda Dealer spent Many hours also got advanced assist from Honda tech Immobilizer unit puts out no errors just losses Key recognition more frequently now. Works perfect after battery cycle.

Yep, a bad MICU will cause this, can you ask the dealer if they have considered that as the problem?

They replaced the MICU i got used from working vehicle same problem also replaced ECM from Honda same problem after programing to VIN.

is the Launch 909E a CAN scanner?

I actually got the 919E newer version both can do - CAN.

Hi,

I noticed we haven't been in touch for a couple of days. Have you been able to make any progress? We are interested in knowing.

Let us know,

Take care,

Joe

No Progress , i am in NYC Tri state area if you know a Honda immobilizer specialist..

I'm sorry, I'm near Pittsburgh, so I'm not familiar with any shops in your area. I wish I could help.

Joe

Hey JACOBANDNICKOLAS,

Thank you, guys, for your help so far. What are the possibilities if you are interested in fixing this CRV? I replaced the Alternator since. It works fine with a wireless cutoff switch so i don't have to pop the hood every time it is happing everyday now. I traced it to the Backup fuse as a drain and it feeds the Immobilizer radio alarm door locks etc.
I think you are 3-4 Hours from Newburgh NY. So let me know how much you will charge to diagnose it. If i bring it to you.
Thanks

Hi,

Unfortunately, we are required to keep things online only. I wish I could be of more help, but I like my job. LOL, I hope you understand.

Joe

That's fine thanks.
Can you please send me some TSB's on Immobilizer and parasitic Drain from Backup fuse drains the new battery in 2 days parked. 2007 Honda CRV EX, when you get a chance. Thanks